Patent Number: 6,310,728

Title: Image viewing apparatus

Abstract: An image viewing apparatus has a stop for limiting light from an original image, and a viewing optical system for guiding the light from the original image, limited by the stop, to the eye of a viewer. The viewing optical system has a prism body including an entrance surface into which the light from the original image is incident, a reflecting surface for reflecting the incident light, and an exit surface from which the reflected light emerges. At least one of the entrance surface, reflecting surface, and exit surface is a curved surface, which is a rotationally asymmetric, aspherical surface. The apparatus satisfies the following condition: where a reference optical axis is defined by a ray emitted from the center of the original image and passing the center of the pupil of the viewer via the viewing optical system, Ly is a width of the original image, and Epy is a distance from the optical element to an intersecting point (on the viewer side) of two rays emitted from two edges of the original image in the extending direction of the intersecting line.

Inventors: Okuyama; Atsushi (Tokorozawa, JP), Kuramochi; Junko (Ninomiya-machi, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G02B 27/01 (20060101); G02B 23/14 (20060101); G02B 027/14 (); G09G 005/00 ()

Expiration Date: 10/30/2018